1. At noon the sun appears white as............
2. Twinkling of stars is due to atmospheric ................
3. The resistivity does not change if ..................
4. Unit of electric power may also be expressed as.................
5. If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be ................
6. The most important safety method used for protecting home appliances from short-circuiting or overloading is ..............
7. The magnetic field inside a long straight solenoid-carrying current ...............
8. Which of the following property of a proton can change while it moves freely in a magnetic field?
9. A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is................
10. If the displacement of an object is proportional to square of time, then the object moves with............
11. A particle is moving in a circular path of radius r. The displacement after half a circle would be............
12. AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?
13. The organisms which cause diseases in plants and animals are called...........
14. Petroleum is mainly a mixture of which one of the following class?
15. In a food chain, the third trophic level is always occupied by __________.
16. Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as ___________.
17. Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called ________
18. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of_________.
19. Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the ___________.
20. Which of the following limits the number of trophic levels in a food chain?
21. The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about_________.
22. If a grasshopper is eaten by a frog, then the energy transfer will be from ________.
23. Which of the statement is incorrect?
24. The main cause for abundant coliform bacteria in the river Ganga is:
25. Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?
26. In a DNA strand the nucleotides are linked together by ..........
27. Appearance of antibiotic-resistant bacteria is an example of............
28. The loudness of sound is measured in units of ...............
29. The loudness of sound is determined by the.............
30. Conduction is the method of transfer of heat in.........
31. Velocity is defined as ……………. per unit time.
32. Minerals are............
33. Which one of the following is a petrochemical?
34. . The clinical test that is used for the diagnosis of typhoid is.................
35. Depletion of ozone is mainly due to _________.
36. According to the evolutionary theory, the formation of a new species is generally due to ..........
37. Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be...........
38. The carbon dioxide dissolved in water...........
40. One carat of diamond is........
41. Sugar in blood and urine is tested with...........
42. TV antenna elements are made up of............
43. Dry ice is............
44. The calorific value of the fuel is of the order...............
45. Which one of the following is correctly matched?
46. Which one of the following is correctly matched?
47. Considered the following statements:Assertion (A): Rusting of iron is quicker in sea water than in river water Reason (R): Salinity helps in carrying current. Now select your answer according to the coding scheme given below.......
48. The chemical used as a fixer in photography is..........
49. The rate of chemical reaction does not depend on...............
50. Cooking oil can be converted into vegetables ghee by the process of................
